Propagation of vortex beams in atmospheric turbulence for uplink satellite links
M.C. Gökçe (TU Delft - Space Systems Egineering)
R. Saathof (TU Delft - Space Systems Egineering)
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Abstract
In this study, we examine the propagation characteristics of vortex-Gaussian beams in atmospheric turbulence for uplink free-space optical (FSO) links. Using the extended Huygens–Fresnel principles, we analytically derive key parameters, including the received intensity, second-order and fourth-order intensity moments, the Strehl ratio, the kurtosis parameter, and the effective beam spot radius. Then, we used phase-screen simulations to analyze the behavior of the scintillation index. Our findings demonstrate that vortex beams offer superior Strehl ratio performance compared to the Gaussian beam and exhibit greater resilience to atmospheric turbulence variations. Furthermore, the vortex beams exhibit kurtosis values below 3 and have a larger effective beam spot radius compared to Gaussian beams. Additionally, vortex beams exhibit a lower scintillation index compared to the Gaussian beam at longer propagation distances.
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